Correction of cross-talk noise in high energy X-ray computed tomography

Effect of cross-talk noise on reconstructed images of high energy X-ray computed tomography is described. Cross-talk noise caused by secondary electrons and/or scattered photons of high energy X-rays generated from adjacent detectors is evaluated using the EGS4 code. Distortion of the projection (Radon transform) is expressed as simultaneous equations based on cross-talk noise and it can be corrected by solving the equations. Random noise contained in the projection, however, is amplified by the correction process. This amplification can be estimated from the determinant of the cross-talk matrix of the simultaneous equations. It is seen that noise amplification does not matter in practical applications when cross-talk noise is less than 0.1